Question

Noble gases are named because of their inertness towards reactively. Identify and incorrect statement about them.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> NEET 2021

• A. Noble gases have large positive values of electron gain enthalpy
• B. Noble gases have very high melting and boiling points
• C. Noble gases are sparingly soluble in water.
• D. Noble gases have weak dispersion forces.

Answer 1

The correct option is B Noble gases have very high melting and boiling points

The noble gases have weak interatomic force (London forces), and consequently have very low melting and boiling points.

They are all monatomic gases under standard conditions, including the elements with larger atomic masses than many normally solid elements.

Due to absence of dipoles and presence of only london forces their solubility in water is very low.

Due to completely filled outermost shell they do not have a tendency to gain or lose $e^{-}$ hence, Their ionisation & electron gain enthalpies are very high.